Perhaps you should try some spelling variations:
duong manh » duong van
cong manh » cong danh, cong thanh, hoang manh
theo chu » theo chieu, cho chu, chao chu
tung dao » tuong dao, hung dao, tung do
tung dan » dung dan, huong dan, trung dai
toan cao » toan ban, toan tap
chu han » chu van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu han - thanh ((tung dao) OR (tung dan)) tong ((cong manh) or (duong manh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu han - thanh ((tung dao) OR (tung dan)) tong ((cong manh) OR (duong manh)) toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu han - thanh ((tung dao) OR (tung dan)) tong ((cong manh) or (duong manh)) toan cao*".